feat: filter out Ubuntu unimportant vulns

[hogo6002]

resolves #1571 and resolves #1572

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.12%. Comparing base (1d6538e) to head (22178cd).

Files with missing lines	Patch %	Lines
internal/grouper/grouper_models.go	0.00%	2 Missing and 1 partial ⚠️
pkg/osvscanner/vulnerability_result.go	40.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1615      +/-   ##
==========================================
- Coverage   69.14%   69.12%   -0.03%     
==========================================
  Files         200      200              
  Lines       19069    19076       +7     
==========================================
+ Hits        13185    13186       +1     
- Misses       5177     5181       +4     
- Partials      707      709       +2     

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